Solis makes it very easy to set a viewports user agent. To access the user agent input controls follow the steps outlined below.
1. Hold the shift key to reveal the blue viewport edit controls.
2. Click the button that contains a target symbol or alternatively, with the shift key held, use the left/right arrow keys to navigate to the view you wish to target and then press the F key with the shift key still held.
3. Navigate to the top right corner of the window frame and left click the button labeled "Set User Agent".